Abstract

Packed-bed adsorptive treatment systems for arsenic removal will be widely employed. We have been conducting rapid small scale column tests (RSSCTs) on many adsorptive media, and frequently track the removal of vanadium, phosphate, silica, and uranium. Phosphate is reported to compete for arsenic adsorption sites. Silica affects surface charge and arsenic removal. Vanadium is listed on the EPA Candidate Contaminant List (CCL2), and some states currently have vanadium regulations. The regulation for uranium has only recently been enforced. All of these elements co-occur with arsenic in groundwaters. This presentation will include batch adsorption data and RSSCT breakthrough curves for these co-occurring ions from natural groundwaters and experiments with model waters. A few brief examples of the findings from continuous flow RSSCTs are summarized as follows: • ArsenxNP (a iron-modified hybrid ion exchange resin) removed uranium and arsenic for ∼ 25,000 bed volumes. Iron (E33) and titanium (Adsorbsia GTO, MetsorbG) medias only removed uranium for < 1000 bed volumes although arsenic was removed for >20,000 bed volumes. Experiments were just initiated on a separate groundwater to evaluate uranium removal using GFH, E33, MetsorbG, and ArsenxNP. • GFH removes more phosphate and silica than E33 • GFH removes As(III) significantly better than E33 • GFH removes more vanadium than any of the other media Batch tests have recently been conducted to compare vanadium removal by different iron and titanium based media. Adsorption isotherms were developed at multiple vanadium concentrations and variable adsorbent dosages. As the drinking water community begins to treat groundwaters for arsenic, renewed attention to the behavior of other trace elements is emerging as an important issue for several reasons. First, these elements potentially affect/compete for arsenic adsorption sites. Second, these elements accumulate in the adsorbent media and may affect the ability to dispose of the media to landfills. Third, it may be necessary to design treatment systems capable of removing these elements as current regulations become enforced and as regulations for other elements (vanadium, molybdenum, selenium) are evaluated.

Original languageEnglish (US)
Title of host publicationAmerican Water Works Association - AWWA Annual Conference and Exposition, ACE 2006: The World's Water Event
Pages6493-6503
Number of pages11
StatePublished - 2006
EventAWWA Annual Conference and Exposition: The World's Water Event, ACE 2006 - San Antonio, TX, United States
Duration: Jun 11 2006Jun 15 2006

Other

OtherAWWA Annual Conference and Exposition: The World's Water Event, ACE 2006
CountryUnited States
CitySan Antonio, TX
Period6/11/066/15/06

Fingerprint

vanadium
arsenic
uranium
ion
regulation
adsorption
groundwater
silica
phosphate
iron
titanium
water
experiment
candidacy
breakthrough curve
removal
molybdenum
selenium
landfill
resin

ASJC Scopus subject areas

  • Water Science and Technology
  • Geography, Planning and Development

Cite this

Westerhoff, P., Benn, T., Kahn, N., & Hristovski, K. (2006). Removal of co-occurring ions during arsenic treatment. In American Water Works Association - AWWA Annual Conference and Exposition, ACE 2006: The World's Water Event (pp. 6493-6503)

Removal of co-occurring ions during arsenic treatment. / Westerhoff, Paul; Benn, Troy; Kahn, Naeem; Hristovski, Kiril.

American Water Works Association - AWWA Annual Conference and Exposition, ACE 2006: The World's Water Event. 2006. p. 6493-6503.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Westerhoff, P, Benn, T, Kahn, N & Hristovski, K 2006, Removal of co-occurring ions during arsenic treatment. in American Water Works Association - AWWA Annual Conference and Exposition, ACE 2006: The World's Water Event. pp. 6493-6503, AWWA Annual Conference and Exposition: The World's Water Event, ACE 2006, San Antonio, TX, United States, 6/11/06.
Westerhoff P, Benn T, Kahn N, Hristovski K. Removal of co-occurring ions during arsenic treatment. In American Water Works Association - AWWA Annual Conference and Exposition, ACE 2006: The World's Water Event. 2006. p. 6493-6503
Westerhoff, Paul ; Benn, Troy ; Kahn, Naeem ; Hristovski, Kiril. / Removal of co-occurring ions during arsenic treatment. American Water Works Association - AWWA Annual Conference and Exposition, ACE 2006: The World's Water Event. 2006. pp. 6493-6503
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